Final answer:
The correct name for the side of the given angle is DE.
Step-by-step explanation:
The correct name for a side of the given angle is A) DE.
In geometry, the sides of an angle are typically named using three points, with the vertex of the angle being the middle point. In this case, the angle is represented by the points D, E, and F, with D being the vertex. The side opposite to the vertex is named using the other two points, so in this case, the correct name for the side is DE.